netmeg - 5:08 pm on May 27, 2013 (gmt 0)
In that time, there's been overwhelming evidence across many discussion groups, my own experiences directly, my client's experiences, and also fellow developers' experiences (that I know and speak to regularly)...that Penguin affected many sites negatively that didn't engage in any "DIYSEO" (they didn't engage in any SEO) - but got penalty-like demotions.
You do understand, of course, that even if your experiences and anecdotal evidence covered hundreds, or thousands, or even ten thousand sites, it would still be statistically insignificant compared to the total number of sites or URLs out there, of every type and every topic.
It's really easy to fall into the trap of "because it's happening to me and these hundred other people, it must be universal" and I fall into that trap all the time myself. But it really gets in the way of trying to parse out what's going on, and how to navigate through it. And of course, to figure out what to do next if you can't.